Powder coating composition, process for producing cured film and coated article
AssigneeAGC Inc.
InventorsShun Saito, Kouji Uchida
Life of this patent
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Abstract
Provided is a powder coating composition, whereby a cured film excellent in water resistance, chemical resistance and weather resistance, can be formed by single coating operation, wherein a fluorinated resin layer and a polyester layer are layer-separated in the process of melting and curing the powder coating composition. A powder coating composition comprising a fluorinated resin (A), a polyester polymer (B), a curing agent (C) and an ultraviolet absorber (D), wherein the polyester polymer (B) is a polyester polymer comprising units derived from a C8-15 aromatic polybasic carboxylic acid compound and units derived from a C2-10 a polyhydric alcohol compound.
Claims19
A powder coating composition comprising:
- a single fluorinated resin (A);
- a polyester polymer (B);
- a curing agent (C);
- and
- an ultraviolet absorber (D),
- wherein the fluorinated resin (A) is a fluorinated polymer having a melting point of at most 200° C. or a fluorinated polymer having a glass transition temperature of from 40 to 150° C.,
- wherein the fluorinated resin (A) does not comprise units derived from vinylidene fluoride,
- wherein the polyester polymer (B) is a polyester polymer comprising units derived from a C8-15 aromatic polybasic carboxylic acid compound which comprises isophthalic acid and units derived from a C2-10 polyhydric alcohol compound,
- wherein the curing agent (C) is selected from the group consisting of a blocked isocyanate curing agent, an amine curing agent, a β-hydroxyalkylamide curing agent, and a triglycidyl isocyanurate, and
- wherein a cured film formed from the powder coating composition comprises a polyester polymer layer made from the polyester polymer (B) and a fluorinated resin layer made from the fluorinated resin (A) with the ultraviolet absorber (D) having a concentration in the fluorinated resin layer that is greater than a concentration in the polyester polymer layer.
A powder coating composition comprising:
- a hydroxyl group-containing fluorinated polymer (A1);
- a polyester polymer (B);
- a blocked isocyanate curing agent (C1);
- and
- an ultraviolet absorber (D1) which is selected from the group consisting of an inorganic ultraviolet absorber and an organic ultraviolet absorber,
- wherein the organic ultraviolet absorber is non-oligomeric and has a molecular weight of from 200 to 1,000 and a melting point of from 50 to 150° C.,
- wherein the hydroxyl group-containing fluorinated polymer (A1) has a melting point of at most 200° C. or a glass transition temperature of from 40 to 150° C.
- wherein the polyester polymer (B) is a polyester polymer comprising units derived from a C8-15 aromatic polybasic carboxylic acid compound which comprises isophthalic acid and units derived from a C2-10 polyhydric alcohol compound, and
- wherein a cured film formed from the powder coating composition comprises a polyester polymer layer made from the polyester polymer (B) and a fluorinated resin layer made from the hydroxyl group-containing fluorinated polymer (A1) with the ultraviolet absorber (D1) having a concentration in the fluorinated resin layer that is greater than a concentration in the polyester polymer layer.
Dependencies are inferred from the claim text.